24 BULLETIN J8, TjNITED STATES NATIONAL MUSEUM. 



wliite line, niid preceded on the co.sta by a distinct black or l)io\vn blotcli. 

 wliicli nsuali.N extends to the inception of the median line. In its course 

 it is acutely dentated on the veins, outwardly oblitpie from costa to 

 vein 4, thence incurved to the inner niar<;in. Subterminal line promi- 

 .nent, Avhite, i)receded ])y a distinct black shade much broader toward 

 the costa and irregularly sinuate and dentate. The median line is dis- 

 tinct, somewhat diffuse, nearly ujiriglit, a little irregular in the ui)per 

 luilf of its course. A black terminal line, which broadens out supe- 

 riorly, forming a somewhat prominent black shading. Fringes sordid 

 yellowish, cut with smoky brown. The orbicuhir is obsolete or small, 

 marked by a diftuse yellowisli spot, which is uever detiued. Keniform 

 notdehned, always evident, rather large, consisting of a yellow lunule, 

 inwardly marked by the median line and outwardly merged into a rusty 

 brownish shade, which extends to the transverse posterior line. Sec- 

 ondaries smoky brown, sometimes paler, often with a yellowish suf- 

 fusion, crossed by three blackish lines. The lirst of these is withm the 

 middle, and is even, not shaded. The second is median, somewhat bent 

 at the middle of its course, and followed by a yellow shading. The third 

 is submarginal, (piite strongly bent about one-third from the costa, and 

 also followed by a yellow shade. A distinct, continuous., black terminal 

 line, beyond which the dusky fringes are cut with yellow. The abdomen 

 is gray, the edges of the segments yellowish white, giving a somewhat 

 obscurely banded a])pearance. Heneath, the wings are dull luteous, 

 with black and white powderings, crossed by three dusky lines, of 

 which the second and third are followed by a ]iale shade. A black 

 terminal line. Secondaries with a linear, black discal mark. 



Expanse of wings, 20 to 1*7 mm. =0.80 to 1.10 inches. 



Habitat.— Canada, southward to Florida to Texas; westward to the 

 Ivocky 3Iountains; Xew Mexico. In its northern range it occurs from 

 July to September; in Texas to November. 



A very common and not very variable species, always distinguished 

 by the pale whitish or bluish gray color and the contrasting transverse 

 lines, M'hich are emphasized on the costa by distinct black or blackish 

 blotches or mniks. The dilation of the ui»per part of the terminal line 

 into a broad sliade is also peculiar to the species, and is a very excel- 

 lent distinctive character. The antenine in the male are furnished 

 with long, stout lateral bristles, longest at basal third and very gradu- 

 ally diminshing toward the tip, set in near the base of each side of 

 each joint. Below this lateral bristle is a short process, inconspicuous 

 toward l)ase, beconiing a short pectination near the middle, and again 

 decreasing toward the tip; becoming first a mere tubercle and theii 

 disap]iearing altogether. This process is furnished with a large sensory 

 bristle at the tip, and is set with smaller hairs at the sides and. base. 

 On the outer side of each joint is another conical eh'vation or tubercle, 

 a little beyond the middle of each joint, and this also gi\es rise to tufts 

 of sensory hairs. This tubercle disappears gradually toward the tip 



